During technology class today, the students were introduced to the robot powered by the salt water. They were divided into few groups and each groups were given a task to assemble the robot. The robot is moved using the brine (concentrated salt water). The concept of electrochemical cell is applied in order to generate the electricity which then moved the motor. Besides, the magnesium and oxygen plat were used as the electrode. During the class, the students not only can relate about what they have learnt in chemistry and physics, but they also enjoy the learning process especially after they are able to make the robot works. At the end of the class, the students were having fun in robot racing competition.